Hi24™ Nonfermenters Identification Kit

Intended Use

KB019 is a comprehensive test system that can be used for the identification of nonfermenters. Organisms belonging to nonfermenters are gram negative and non sporulating and are isolated from clinical samples. Hi24™ Nonfermenters Identification kit can be used for screening pathogenic organisms from urine, enteric specimens and other relevant clinical samples. Organism isolated includes the genus Acinetobacter, Bordetella, Burkholderia, Legionella, Moraxella, Pseudomonas and Stenotrophomonas. It can also be used for validating known laboratory strains. The complete list of organisms that can be identified with this system is given in the identification index provided with the kit.

Principle

Each Hi24™ Nonfermenters Identification kit is a standardized colorimetric identification system utilizing twelve conventional biochemical tests and twelve carbohydrate utilization tests. The tests are based on the principle of pH change and substrate utilization. On incubation organisms undergo metabolic changes which are indicated as a colour change in the media that can be either interpreted visually or after addition of the reagent.

Kit contents

1. Each kit contains sufficient material to perform 10 tests
2. 10 strips of KB019
3. Technical product insert
4. Result Interpretation Chart and Result Entry Datasheet
5. Identification Index

Type of specimen

Clinical samples: Blood, Urine, Faeces, Enteric, Nosocomial and other relevant clinical samples.

Specimen Collection and Handling

For clinical samples follow appropriate techniques for handling specimens as per established guidelines.

Warning and Precautions

In Vitro diagnostic Use only. Read the label before opening the kit. Clinical samples and microbial cultures should be considered potentially pathogenic and handled accordingly. Aseptic conditions should be maintained during inoculation and handling of the kits. Reagents should not come in contact with skin, eyes or clothing. Wear protective gloves/protective clothing/eye protection/ face protection. Follow good microbiological lab practices while handling specimens and culture. Standard precautions as per established guidelines should be followed while handling clinical specimens. Safety guidelines may be referred in safety data sheets.

Limitations

1. KB019 cannot be used directly on clinical specimens. The organisms to be identified have to be first isolated and purified. Only pure cultures should be used.
2. In case of Carbohydrate fermentation test some microorganisms show weak reaction. In this case record the reaction as + and incubate further upto 48 hours.
3. At times organisms give contradictory result because of mutation or the media used for isolation, cultivation and maintenance.
4. The identification index has been compiled from standard references and results of tests obtained in the laboratory.

Performance and Evaluation

Performance of the medium is expected when used as per the direction on the label within the expiry period when stored at recommended temperature.

Instructions for use Interpretation of Results

Interpret results as per the standards given in the Result Interpretation Chart. Addition of reagents in well nos 1, 5, 8 and 12 should be done at the end of incubation period, that is after 18 - 24 hours. Following reagents to be added to the respective wells.

Indole Test: Well No.1

Add 1-2 drops of Kovac's reagent (R008). Development of reddish pink colour within 10 seconds indicates positive reaction. Reagent remains pale coloured if the test is negative.

Nitrate Reduction Test: Well No.5

Add 1-2 drops of Sulphanilic acid (R015) and 1-2 drops of a-Naphthylamine Solution (R009) Immediate development of pinkish red colour on addition of reagent indicates positive reaction No change in colour indicates a negative treatment.

Phenylalanine Deamination Test – Well No.8

Add 2-3 drops of TDA Reagent. Development of dark green colour within one minute indicates positive reaction. No change in colour denotes a negative reaction.

Oxidase Test – Well No.12

Add 1-2 drops of Gordon McLeod Reagent. Development of purplish blue colour within 5-10 seconds indicates positive reaction. Delayed positive reaction upto 60 seconds may be noted. No change in colour or delayed positive reaction upto 60 seconds denotes a negative reaction.

Important points to be taken into consideration while interpreting the result

1. Allow the reagents to come to room temperature after removal from the refrigerator.

Disposal of used material

After use, kits and the materials used for isolation and inoculation (pipettes, loops etc.) must be disinfected using a suitable disinfectant and then discarded by incineration or autoclaving in a disposable bag.

Instructions for use

Preparation of Inoculum

• Isolate the organism to be identified on a common medium like Nutrient Agar (M001/M1274) or Brain Heart Infusion Agar (M211).
• Pick up a single well isolated colony and inoculate in 5ml Brain Heart Infusion broth and incubate at 35-37°C for 4-6 hours until the inoculum turbidity is 0.1 OD at 620nm or 0.5 Mcfarland standard.
• Alternatively, a homogeneous suspension made in 2-3 ml sterile saline can be used for inoculation.
• The density of the suspension should be adjusted to 0.1 OD at 620nm or 0.5 Mcfarland standard.

Note :

• Erroneous false negative results may be obtained if the inoculum turbidity is less than 0.1 OD.
• Results are more prominent when enriched culture instead of suspension.

Inoculation of the kit

• Open the kit aseptically. Peel off the sealing tape.
• Inoculate each well with 50 µl of the above inoculum by surface inoculation method.
• Alternatively the kit can be inoculated by stabbing each individual well with a loopful of inoculum.

Incubation

• Temperature of incubation: 35-37°C. Duration of incubation: 24-48 hours.

Storage and Shelf life

On receipt, store at 2-8°C. Shelf life is 12 months. Product performance is best if used within stated expiry period.

Identification Index